CVE-2026-98273

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98273", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.334Z", "datePublished": "2026-10-06T08:45:34.645Z", "dateUpdated": "2026-10-19T09:16:44.960Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:16:44.960Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kprobes: Fix crash when probing CS CALL instructions\n\nWhen using eBPF to probe CS CALL instructions within a function,\na crash can be triggered.\n\nThe eBPF tool probes offset 257 of the __hrtimer_run_queues()\nfunction:\n\n<__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1)\n<__hrtimer_run_queues+254>: mov %r14,%rdi\n<__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12>\n<__hrtimer_run_queues+263>: mov %eax,%r12d\n<__hrtimer_run_queues+266>: xchg %ax,%ax\n<__hrtimer_run_queues+268>: mov %r13,%rdi\n\nWhich triggers this crash:\n\n BUG: unable to handle page fault for address: 00000000000f41c9\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#1] SMP NOPTI\n CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P\n RIP: 0010:__hrtimer_run_queues+0x106/0x230\n\nNote that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is\nat the 6th byte of the above CS CALL instruction. Since the CS CALL\ninstruction occupies 6 bytes, the exception occurred in the middle of that\ncall instruction.\n\nThe root cause is that when using eBPF tools to probe in the middle of a\nfunction, a kprobe with INT3 is used as the underlying implementation.\n\nDuring single-step emulation of the original CALL instruction,\nint3_emulate_call() assumes that the probed CALL instruction is 5 bytes\nlong. However, the actual CS-prefixed CALL instruction occupies 6 bytes,\nso it constructs an incorrect exception return address. When the CPU\nreturns from the kprobe handler, the next instruction to be executed is at\nthe address of the last byte of that CS CALL instruction. Coincidentally,\nstarting from that address, the CPU fetches and decodes a completely\ndifferent instruction, which ultimately triggers a kernel crash.\n\nFix the issue by using the actual instruction length obtained from\nthe instruction decoder when constructing the exception return\naddress, rather than relying on the hardcoded CALL_INSN_SIZE macro.\n\n[ mingo: Refined the changelog ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/include/asm/text-patching.h", "arch/x86/kernel/alternative.c", "arch/x86/kernel/kprobes/core.c"], "versions": [{"version": "6256e668b7af9d81472e03c6a171630c08f8858a", "lessThan": "cfc1af3d054aaabee08f1f77c441b3533b082869", "status": "affected", "versionType": "git"}, {"version": "6256e668b7af9d81472e03c6a171630c08f8858a", "lessThan": "d8c6a18c0552135cbf0c696c9019b2979d0862c9", "status": "affected", "versionType": "git"}, {"version": "6256e668b7af9d81472e03c6a171630c08f8858a", "lessThan": "a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255", "status": "affected", "versionType": "git"}, {"version": "ba7d1dae9fe866abe74bb1e849fb85983b7c4c37", "status": "affected", "versionType": "git"}, {"version": "5.10.190", "lessThan": "5.11", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/include/asm/text-patching.h", "arch/x86/kernel/alternative.c", "arch/x86/kernel/kprobes/core.c"], "versions": [{"version": "5.13", "status": "affected"}, {"version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.18.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.2.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.190"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cfc1af3d054aaabee08f1f77c441b3533b082869"}, {"url": "https://git.kernel.org/stable/c/d8c6a18c0552135cbf0c696c9019b2979d0862c9"}, {"url": "https://git.kernel.org/stable/c/a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255"}], "title": "x86/kprobes: Fix crash when probing CS CALL instructions", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/x86/include/asm/text-patching.h", "arch/x86/kernel/alternative.c", "arch/x86/kernel/kprobes/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cfc1af3d054aaabee08f1f77c441b3533b082869", "status": "affected", "version": "6256e668b7af9d81472e03c6a171630c08f8858a", "versionType": "git"}, {"lessThan": "d8c6a18c0552135cbf0c696c9019b2979d0862c9", "status": "affected", "version": "6256e668b7af9d81472e03c6a171630c08f8858a", "versionType": "git"}, {"lessThan": "a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255", "status": "affected", "version": "6256e668b7af9d81472e03c6a171630c08f8858a", "versionType": "git"}, {"status": "affected", "version": "ba7d1dae9fe866abe74bb1e849fb85983b7c4c37", "versionType": "git"}, {"lessThan": "5.11", "status": "affected", "version": "5.10.190", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/x86/include/asm/text-patching.h", "arch/x86/kernel/alternative.c", "arch/x86/kernel/kprobes/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"lessThan": "5.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kprobes: Fix crash when probing CS CALL instructions\n\nWhen using eBPF to probe CS CALL instructions within a function,\na crash can be triggered.\n\nThe eBPF tool probes offset 257 of the __hrtimer_run_queues()\nfunction:\n\n<__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1)\n<__hrtimer_run_queues+254>: mov %r14,%rdi\n<__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12>\n<__hrtimer_run_queues+263>: mov %eax,%r12d\n<__hrtimer_run_queues+266>: xchg %ax,%ax\n<__hrtimer_run_queues+268>: mov %r13,%rdi\n\nWhich triggers this crash:\n\n BUG: unable to handle page fault for address: 00000000000f41c9\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#1] SMP NOPTI\n CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P\n RIP: 0010:__hrtimer_run_queues+0x106/0x230\n\nNote that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is\nat the 6th byte of the above CS CALL instruction. Since the CS CALL\ninstruction occupies 6 bytes, the exception occurred in the middle of that\ncall instruction.\n\nThe root cause is that when using eBPF tools to probe in the middle of a\nfunction, a kprobe with INT3 is used as the underlying implementation.\n\nDuring single-step emulation of the original CALL instruction,\nint3_emulate_call() assumes that the probed CALL instruction is 5 bytes\nlong. However, the actual CS-prefixed CALL instruction occupies 6 bytes,\nso it constructs an incorrect exception return address. When the CPU\nreturns from the kprobe handler, the next instruction to be executed is at\nthe address of the last byte of that CS CALL instruction. Coincidentally,\nstarting from that address, the CPU fetches and decodes a completely\ndifferent instruction, which ultimately triggers a kernel crash.\n\nFix the issue by using the actual instruction length obtained from\nthe instruction decoder when constructing the exception return\naddress, rather than relying on the hardcoded CALL_INSN_SIZE macro.\n\n[ mingo: Refined the changelog ]"}], "id": "CVE-2026-98273", "lastModified": "2026-10-19T10:18:28.617", "metrics": {}, "published": "2026-10-06T09:18:16.937", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cfc1af3d054aaabee08f1f77c441b3533b082869"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d8c6a18c0552135cbf0c696c9019b2979d0862c9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: x86/kprobes: Fix crash when probing CS CALL instructions", "id": "2546488", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546488"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-823", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nx86/kprobes: Fix crash when probing CS CALL instructions\nWhen using eBPF to probe CS CALL instructions within a function,\na crash can be triggered.\nThe eBPF tool probes offset 257 of the __hrtimer_run_queues()\nfunction:\n<__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1)\n<__hrtimer_run_queues+254>: mov %r14,%rdi\n<__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12>\n<__hrtimer_run_queues+263>: mov %eax,%r12d\n<__hrtimer_run_queues+266>: xchg %ax,%ax\n<__hrtimer_run_queues+268>: mov %r13,%rdi\nWhich triggers this crash:\nBUG: unable to handle page fault for address: 00000000000f41c9\n#PF: supervisor write access in kernel mode\n#PF: error_code(0x0002) - not-present page\nPGD 0 P4D 0\nOops: 0002 [#1] SMP NOPTI\nCPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P\nRIP: 0010:__hrtimer_run_queues+0x106/0x230\nNote that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is\nat the 6th byte of the above CS CALL instruction. Since the CS CALL\ninstruction occupies 6 bytes, the exception occurred in the middle of that\ncall instruction.\nThe root cause is that when using eBPF tools to probe in the middle of a\nfunction, a kprobe with INT3 is used as the underlying implementation.\nDuring single-step emulation of the original CALL instruction,\nint3_emulate_call() assumes that the probed CALL instruction is 5 bytes\nlong. However, the actual CS-prefixed CALL instruction occupies 6 bytes,\nso it constructs an incorrect exception return address. When the CPU\nreturns from the kprobe handler, the next instruction to be executed is at\nthe address of the last byte of that CS CALL instruction. Coincidentally,\nstarting from that address, the CPU fetches and decodes a completely\ndifferent instruction, which ultimately triggers a kernel crash.\nFix the issue by using the actual instruction length obtained from\nthe instruction decoder when constructing the exception return\naddress, rather than relying on the hardcoded CALL_INSN_SIZE macro.\n[ mingo: Refined the changelog ]", "A flaw was found in the Linux kernel's x86 kprobes subsystem. A privileged local user could cause a Denial of Service (DoS) and system crash when attaching probes to certain function call instructions using tracing tools such as extended Berkeley Packet Filter (eBPF). This issue occurs because the kernel incorrectly calculates the instruction size and return address during emulation of Code Segment (CS) prefixed call instructions, causing the processor to execute corrupted instructions and crash."], "name": "CVE-2026-98273", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98273\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98273\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98273.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6256e668b7af9d81472e03c6a171630c08f8858a,cfc1af3d054aaabee08f1f77c441b3533b082869)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6256e668b7af9d81472e03c6a171630c08f8858a,d8c6a18c0552135cbf0c696c9019b2979d0862c9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6256e668b7af9d81472e03c6a171630c08f8858a,a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "ba7d1dae9fe866abe74bb1e849fb85983b7c4c37"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[5.10.190,5.11)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.54,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.8,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-06T14:15:17.996135+00:00", "updated": "2026-10-11T06:00:12.284603+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}